使用jersey 注解包扫描类PackageNamesScanner

Jersey 中自带一个包扫描，可以是包，或者具体类名，扫描的类型是自己定注解类型，实现功能更加大，可以是jar 包可以是虚拟地址下的

Jersey 主要用来扫描Path Provider 类中同时包括以上的Annotation,使用Jersey 包扫描只需要三步。

1 String aa[] = new String[]{"com.jerweb"};
2 Scanner scanner =  new PackageNamesScanner(checkNotNull(aa));
3 final AnnotationScannerListener asl = new PathProviderScannerListener();
4 scanner.scan(asl);
5 Set<Class<?>> sets=  asl.getAnnotatedClasses();

1、包地址传入PackageNamesScanner

2、自定义的注解实现AnnotationScannerListener 的子类

3、scan

查看Jesery PathProviderScannerListener源码

 1 public final class PathProviderScannerListener extends AnnotationScannerListener {
 2 
 3     /**
 4      * Create a scanning listener to check for Java classes in Java
 5      * class files annotated with {@link Path} or {@link Provider}.
 6      *
 7      */
 8     public PathProviderScannerListener() {
 9         super(Path.class, Provider.class);
10     }
11 
12     /**
13      * Create a scanning listener to check for Java classes in Java
14      * class files annotated with {@link Path} or {@link Provider}.
15      *
16      * @param classloader the class loader to use to load Java classes that
17      *        are annotated with any one of the annotations.
18      */
19     public PathProviderScannerListener(ClassLoader classloader) {
20         super(classloader, Path.class, Provider.class);
21     }
22 }

View Code

很简单。自定义实现AnnotationScannerListener 的子类，就可以用来扫描自定义注解

@Inherited
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Err {
    String value();
}

@Inherited
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface Info {
    String value();
}

public class ErrInfoScannerListener extends AnnotationScannerListener {

    public ErrInfoScannerListener() {
        super(Err.class, Info.class);
    }

    /**
     * Create a scanning listener to check for Java classes in Java
     * class files annotated with {@link Err} or {@link Info}.
     *
     * @param classloader the class loader to use to load Java classes that
     *        are annotated with any one of the annotations.
     */
    public ErrInfoScannerListener(ClassLoader classloader) {
        super(classloader, Err.class, Info.class);
    }
}

测试以上代码

 1 public static void main(String[] args)
 2     {
 3         String aa[] = new String[]{"com.jerweb"};
 4         Scanner scanner =  new PackageNamesScanner(checkNotNull(aa));
 5         final AnnotationScannerListener asl = new PathProviderScannerListener();
 6         final AnnotationScannerListener asl1 = new ErrInfoScannerListener();
 7         scanner.scan(asl1);
 8         scanner.scan(asl);
 9         Set<Class<?>> sets1 = asl1.getAnnotatedClasses();
10         Set<Class<?>> sets=  asl.getAnnotatedClasses();
11 
12     }

Maven 引用包

         <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-core</artifactId>
            <version>1.18.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>1.18.1</version>
        </dependency>

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原文地址：https://www.cnblogs.com/shouhongxiao/p/5799913.html